- To assess the immunogenicity of Influenza VLP Vaccine administered at 15 µg and 60 µg HA per strain as measured by hemagglutination inhibition (HAI) antibody titers to each of the component viral strains [A/Brisbane/59/2007 (H1N1); A/Brisbane/10/2007 (H3N2) and B/Brisbane/60/2008].